It's Washburn -- random-seeming stuff happens all the time.
Three weeks ago, I almost bought an X-40 with appointments similar to your guitars -- white finish, gold hardware.
Last year, I started putting together a comprehensive list of X Series guitars. This was quite simple... except for the X-50 subseries.
I'm hardly the only one -- user Chaos Rex
compiled a substantial X-50 list (a decade ago
There's no good reason to believe that list is complete.
In recent years, the previous owners of Washburn frequently created brief "special edition" variants of various models for big retailers, as well as limited editions for certain shops (likeFunky Munky or Boogies Street). None of these are considered standrd models, none will have appeared in Washburn's catalogue or on their website.